1. technology and computing

DETROIT DT12
TRANSMISSION
™
™
12
Speeds
FROM
TOP GEAR
lb-ft Torque Input
DIRECT or OVER
Drive
1250-2050
THE DETROIT AUTOMATED
MANUAL TRANSMISSION
™
THE BEST OF
DETROIT IS PROUD TO OFFER THE DT12™ AUTOMATED MANUAL TRANSMISSION.
ENGINEERED AND BUILT WITH PRECISION. OPTIMIZED FOR PERFORMANCE AND
EFFICIENCY.
WHAT’S AN AUTOMATED
MANUAL TRANSMISSION?
An automated manual transmission (AMT) combines a traditional
clutch-actuated manual gearbox with a computer-controlled
shift actuator and clutch. The best shift patterns are selected
electronically to provide optimal power and fuel efficiency. An
AMT is a proven technology used around the world. At Detroit, we
believe it represents the next generation. With computer-controlled
shifting and clutch engagement, only two pedals are needed to
operate the truck: brake and accelerator.
WHY CONSIDER AN AMT?
An automated manual transmission is more fuel-efficient, especially
when you average fuel consumption over an entire fleet traveling
a variety of routes. Automated control of the clutch improves shift
quality and leads to longer clutch life. And it’s easier to operate,
making it ideal for drivers of all experience levels.
DT12 FUEL ECONOMY IMPROVEMENT
FLEET AVERAGE FUEL ECONOMY
All Data Manual
All Data DT12
The DT12 will narrow the bell curve of
your drivers’ fuel economy. Fleets should
see fuel economy improvements for new
and lead-footed drivers.
Note: Numbers are for demonstration purposes only.
Not based on actual testing.
BOTH WORLDS
EASE AND ECONOMY GO INTO
HIGH GEAR.
At Detroit, we are focused on providing our customers with the
We understand how fleets work and how they succeed. Any
most efficient powertrain components possible. The Detroit DT12
incremental increase in fuel economy can make a huge impact
provides efficiency in three ways: fuel economy, durability and
on profitability. Our engineers have made significant strides to
ease of operation.
reduce fuel consumption with this new transmission.
A fleet’s bottom line also is affected by the durability and
longevity of its vehicles. The operation of our DT12 was designed
to limit unnecessary wear and tear. The smoother the action, the
more efficient the results.
Driver recruitment, training and performance play crucial
roles in fleet efficiency. That’s why we chose to offer an
AMT. It’s easy to master, so drivers can reach their optimal
performance sooner.
The Detroit DT12 is part of our complete line of powertrain
components that also includes our famous engines and our
full line of axles. When you spec your truck with the entire
package, you can expect an even greater level of efficiency, from
operational performance to maintenance and warranty service.
Ultimate efficiency goes beyond managing fuel consumption.
It’s the result of knowledge and ingenuity. That’s what makes this
transmission different.
ULTIMATE EFFICIENCY:
IT’S THE RESULT OF
KNOWLEDGE AND INGENUITY.
ENGINEERED FOR
ECONOMY
THE DETROIT DT12 IS A 12-SPEED, AUTOMATED MANUAL TRANSMISSION WITH
SHORTER GEAR STEPS. THE DETROIT DT12 WAS DESIGNED WITH A NUMBER
OF INNOVATIVE EFFICIENCY FEATURES TO ACHIEVE OPTIMAL FUEL ECONOMY.
Optional Direct Drive. In top gear, the transmission
operates as a direct drive, sending engine input directly
through the main shaft, eliminating parasitic gear
mesh losses of power and increasing fuel efficiency.
eCoast. Helps maximize fuel
efficiency by allowing the
vehicle to coast down grades.
The engine operates at idle
speeds while maintaining
momentum. Sophisticated
transmission electronics
ensure safe operation in
all driving conditions.
Powertrain Communication. The transmission communicates in
real time with the proprietary powertrain network and motor-control
module to optimize efficiency throughout the entire powertrain.
Total Weight. The Detroit
DT12 provides a weight
advantage over traditional
designs. The aluminum
housing and single
countershaft help save
weight, allowing for even
more payload efficiency.
Skip Shift. To increase shifting efficiency, the electronic
powertrain controls automatically skip unnecessary
gears. This helps increase acceleration to achieve
cruising speed quickly and smoothly. This also lets the
driver begin the acceleration in the appropriate start
gear based on load and grade.
Active Driveline Protection. The Transmission Control
Module (TCM) calculates the torque wind-up in the
driveline and regulates with engine torque control for
enhanced driving comfort and less driveline wear. The
TCM even limits torque in severe surface conditions,
protecting the driveline.
Oil Pump. An oil pump, powered by the countershaft,
delivers oil directly to the gears. This is more precise
and efficient than bathing all of the gears in oil.
VARIABLE-SPEED CRUISE CONTROL
The DT12 incorporates variable-speed cruise control, which allows the engine brake to regulate speed to
achieve optimal driving efficiency. With the engine brake set to off, drivers can choose from the three settings
on the cruise control limit switch located on the dash:
LOW is ideal for steep grades. The engine brake slows the truck at a low threshold, e.g., +3 mph.
MEDIUM is ideal for rolling hills. The engine brake slows the truck at a higher threshold, e.g., +6 mph.
OFF is ideal for flat terrain or areas with noise restrictions. The engine brake is disabled while in cruise.
Variation level can be changed as a parameter in the TCM. Using these settings helps control downhill
speed and takes advantage of uphill momentum. The TCM will determine the right amount of engine braking
required, or may be overridden using the engine brake selection on the shift lever.
INTELLIGENT POWERTRAIN MANAGEMENT
Intelligent Powertrain Management knows the route ahead and will accelerate, preselect gears, eCoast
and brake the engine to maximize efficiency. Using preloaded terrain maps, IPM will adjust the following
to ensure the truck is carrying the most efficient momentum into road conditions ahead.
– DT12 shift strategy
– eCoast
– Engine torque output
– Engine braking level
Since IPM is integrated with cruise control, there are ideal driving situations and terrains where the fuel
efficiency benefit is greatest. Also, the more time spent in cruise control, the more effectively IPM will work.
– High top gear and top-1 gear times
– High cruise control times
– Rolling terrain
– Mountainous terrain
– Varying speed limits
Normal Driving Situation
Driver Decision
Intelligent Powertrain Management
Approaching a grade
Downshift and accelerate
Hold gear (DT12 can shift while climbing) and
minimal acceleration (calculated within CPC)
Cresting a hill
Upshift and resume cruise control
eCoast over the summit and engine brake when
speed approaches CC-band limit
Rolling hills
Accelerate uphill and decelerate downhill
Transition from deceleration to acceleration (and vice versa)
while still on grade to carry momentum into the next hill
DRIVEN TO
PERFORM
The DT12 is engineered for enhanced flexibility and drivability.
Detroit DT12 Specifications
The term “automated” means a pneumatic clutch and shift actuator
Speeds
12 forward / 4 reverse
actually shift the transmission for you. This allows faster and
Torque Ratings
1250–2050 lb-ft
Gear Ratios / Overall Ratio
Direct Drive: 14.93 - 1 / 14.93
Overdrive: 11.67 - 0.78 / 14.96
package spec’d with the DT12:
GCW Limits
Direct Drive: 80,000 lbs.
Overdrive: 130,000 lbs.*
ECONOMY PACKAGE only includes automated economy mode.
Dry Weight
518–639 lbs.
Oil Capacity
10.7–15.4 qts.
smoother gear shifts than electronic actuation.
Drivers can choose between shift modes depending on the
Shifts happen automatically and keep RPMs to an efficient level.
STANDARD PACKAGE includes automated economy and manual
*With a dual-plate clutch. Application approval required.
shift modes, for when terrain or conditions need manual control.
PERFORMANCE PACKAGE includes the standard package plus
automated performance mode, with higher RPM shifts to take full
advantage of available power and torque. A kickdown accelerator
pedal is also included that downshifts or holds a lower gear at
full throttle.
An additional performance feature:
CREEP MODE modulates the clutch to improve low-speed
Creep Mode makes backing up to a loading dock safe and easy.
maneuverability, ideal for backing up to a loading dock or
maneuvering through tight city traffic. All the driver has to do
is let off the brake pedal.
SERVICE TAKEN TO A HIGHER LEVEL
Detroit transmissions are sold and serviced by an unmatched
network of knowledgeable sales people and expert factorytrained technicians at hundreds of locations throughout the
United States and Canada. We also offer a live Customer
Support Call Center.
WARRANTY COVERAGE
Detroit is known for designing and manufacturing products
that set industry standards. We are proud of that, and
believe that quality is the surest way to maintain long-lasting
relationships with our customers. And it lets Detroit offer
Detroit offers outstanding parts availability, and transmission
excellent warranty coverage. Our transmissions come with a
owners enjoy comprehensive warranty coverage—including
five-year/750,000-mile standard warranty. The clutch comes
fast, hassle-free processes—and expedited parts and service
with a three-year/350,000-mile warranty.
for critical downtime situations.
INNOVATIONS IN
SAFETY
KEEP DRIVERS SAFE AND FLEETS MOVING.
The DT12 includes a variety of innovative safety features that help protect the driver and entire vehicle, as well as enhance the
driving experience. Because the transmission is automated, new drivers experience a shorter learning curve. Various driver interfaces have been designed to reduce driver fatigue, including a true two-pedal system along with convenience features like the
shift lever and cruise control. Other advanced features include:
HILL START AID
When stopped on grades of 6% or more, the vehicle is
prevented from rolling backward on uphill grades or forward
on a downhill grade.
AUTO NEUTRAL
When the parking brake is engaged or the vehicle is shut
down, the transmission electronically commands neutral gear.
The shifter must be moved to N (neutral) before the truck is
started again.
VIRTUAL TECHNICIAN™ ONBOARD DIAGNOSTIC SYSTEM
The shift lever includes gear, auto/manual mode and engine brake selection for
excellent ergonomics.
Prevents unsafe driving situations from occurring by alerting the
driver to engine or transmission faults that could cause damage.
If the vehicle is stopped on an incline, the Hill Start Aid prevents rollback.
VIRTUAL TECHNICIAN
Our factory-installed Virtual Technician onboard diagnostic
Virtual Technician’s optional Visibility Package is a fleet
system takes the guesswork out of transmission repair. When
management system that offers access to the Ground Traffic
a truck’s transmission check light illuminates, information
Control website. This groundbreaking system captures latitude,
is sent to you and the Detroit Customer Support Center
longitude, time and odometer readings for your trucks. With
(CSC), where a trained representative can diagnose the issue,
pinpoint accuracy, the system records vehicle stops, speeds,
recommend service and even contact the nearest authorized
routes traveled, mileage by state, excessive idling, fuel
locations with parts in stock. The CSC can tell you if you need
consumption and other onboard events. The Visibility Package
to pull over, so you don’t cause further damage, or if you can
helps you manage your business more efficiently.
stay on the road. Put simply, it’s like having a technician in
every truck.
EMPOWERED BY DETROIT
Here at Detroit, we’ve built our reputation by building high-quality products that perform
beyond expectations. Today, you’ll find our engines in Freightliner and Western Star trucks
on roads and at job sites around the globe.
The secret to our success goes beyond the engines we build. Our people and our continuous
pursuit of innovation are powerful driving forces. Our engineering and manufacturing
expertise are world-class. Our service network is expansive and responsive. That’s why
we continue to grow and evolve. It’s also why we now offer a full line of products: engines,
axles, transmissions and advanced technologies. That’s right. The company that makes
the heart of the truck now gives you the arms, legs and backbone to go with it. So, if you
demand it all, demand Detroit.
DEMANDDETROIT.COM
DDC-EMC-BRO-0069-0814. Specifications are subject to change without notice. Detroit Diesel Corporation
is registered to ISO 9001:2008. Copyright © 2014 Detroit Diesel Corporation. All rights reserved. Detroit ™ is
a brand of Detroit Diesel Corporation, a subsidiary of Daimler Trucks North America LLC, a Daimler company.